Ultrashort single-mode pulse propagation on CPW with air-bridges observed by photoconductive pump-probe measurement

Jongjoo Lee; Joungho Kim

doi:10.1117/12.370174

12 November 1999 Ultrashort single-mode pulse propagation on CPW with air-bridges observed by photoconductive pump-probe measurement

Jongjoo Lee, Joungho Kim

Author Affiliations +

Proceedings Volume 3795, Terahertz and Gigahertz Photonics; (1999) https://doi.org/10.1117/12.370174
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We firstly demonstrate the effects of the air-bridges on the coplanar waveguide (CPW) for the single-mode pulse propagation using a picosecond time-domain pump-probe measurement. The picosecond photoconductive sampling technique is able to measure the transmitted and reflected pulses with a picosecond temporal resolution corresponding to a 300-GHz frequency bandwidth. It is found that more than two of the crossing air-bridges over the CPW are needed to support the single-mode propagation. The crossing air-bridge is found to behave as a bypass capacitor to an incoming pulse. For the air-bridges used for connecting the ground planes along the CPW, the length of the air-bridge is founded more critical. The air-bridges have exhibited more than 30-dB return loss up to 300-GHz. Finally, the s- parameters of open and short terminations were measured using the embedded CPW with the proposed air-bridge structures.

Citation Download Citation

Jongjoo Lee and Joungho Kim "Ultrashort single-mode pulse propagation on CPW with air-bridges observed by photoconductive pump-probe measurement", Proc. SPIE 3795, Terahertz and Gigahertz Photonics, (12 November 1999); https://doi.org/10.1117/12.370174

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